Significance of Deuteron Breakup in Halo Transfer

 We discuss the quasi-adiabatic approximations to the three-body wave-function in breakup processes and clarify the assumptions underlying the model. This suggests alternative approximation schemes. Using different theoretical three-body models, calculated angular distributions of differential cross sections for the ¹¹Be(p,d) reaction are presented, for which new preliminary data have been reported at 35 MeV. We show that calculations are sensitive to the inclusion of deuteron breakup and to the breakup model used, particularly if absolute spectroscopic information on the 0⁺ and 2^{+ 10}Be core-state parentages is deduced. There is also considerable sensitivity to the model employed in calculations of the relative cross sections of the two states. Received January 19, 1999; revised April 16, 1999; accepted for publication February 28, 2000